Microsoft Corporation (MSFT)

Microsoft is the company that made software a business. For four decades, it has been the invisible infrastructure underneath most of the world's offices, governments, and enterprises — and now it's becoming the backbone of the AI era.

Bill Gates and Paul Allen founded Microsoft in 1975 to write software for the earliest personal computers. Their big break came in 1980 when IBM needed an operating system for its new PC. Gates licensed them MS-DOS, then retained the right to sell it to everyone else. That single deal — selling the same software to every PC manufacturer — created one of history's greatest business models.

Today Microsoft earns revenue across three segments: Intelligent Cloud (Azure, server products — the fastest-growing segment), Productivity and Business Processes (Office 365, LinkedIn, Dynamics), and Personal Computing (Windows, Xbox, Surface). Azure is the world's second-largest cloud platform and growing rapidly as enterprises move workloads off their own servers. Office 365 has over 400 million paid seats — entire companies would grind to a halt without it.

Microsoft's moat is enterprise entrenchment. When your company runs on Outlook, Teams, Excel, Azure Active Directory, and Windows, replacing Microsoft means replacing everything at once. No CIO wants that risk. This creates decades-long customer relationships with near-zero churn.

The key risk is execution in AI. Microsoft invested $13 billion in OpenAI and is embedding AI across every product. If this bet pays off, Microsoft becomes the platform for AI-powered work. If AI commoditizes or OpenAI's lead fades, Microsoft spent billions for a temporary advantage. The company's history suggests they'll adapt — they survived the internet transition, the mobile era, and the cloud shift.